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Production process for medium-high carbon steel through thin slabs

A production process, medium and high carbon technology, applied in the field of steel alloys, can solve problems such as internal cracks, surface cracks, and small thermal melting of the mold

Inactive Publication Date: 2016-05-04
ANHUI CHUJIANG SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high carbon content of medium-high carbon steel, the solidification area is enlarged, and the center segregation and center porosity are prone to occur during the solidification process of the billet. After rolling, the central part of the coil is prone to delamination; and thermal stress are large, high-temperature thermoplasticity is low, and cracks inside and on the surface of the slab are prone to occur; in addition, the freezing point of medium-high carbon steel is low, the thermal melting amount of the mold is small, and the casting speed of conventional slab continuous casting is low, crystallization The liquid surface of the tool steel is not active, the melting conditions of mold slag are not good, and defects such as slag inclusion and heavy skin are prone to appear on the surface of the slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] S1. Weigh the chemical composition as carbon 0.6%, silicon 0.3%, manganese 0.7%, phosphorus ≤ 0.025%, sulfur 0.0024%, chromium 0.1%, nickel 0.1%, arsenic 0.03%, copper 0.19%, aluminum ≤ 0.02% and the rest The amount is iron, and the pre-desulfurization operation is carried out by using desulfurized molten iron to obtain the material;

[0045] S2. Putting the material obtained by pre-desulfurization in step S1 into a vacuum smelting converter for smelting to obtain an alloy steel billet;

[0046] S3, placing the alloy steel billet obtained in step S2 on a continuous casting machine for continuous casting operation to obtain alloy steel profiles;

[0047] S4. After heat-treating the alloy steel profile obtained in step S3, performing a cutting operation to obtain a crude alloy steel;

[0048] S5, sending the cut alloy steel crude product obtained in step S4 to a rolling mill for hot rolling and fine hot rolling to obtain a thin slab medium-high carbon steel product;

[...

Embodiment 2

[0055] S1. Weigh the chemical composition as carbon 0.88%, silicon 0.68%, manganese 1.55%, phosphorus ≤ 0.025%, sulfur 0.002%, chromium 0.22%, nickel 0.12%, arsenic 0.035%, copper 0.20%, aluminum ≤ 0.02% and other The amount is iron, and the pre-desulfurization operation is carried out by using desulfurized molten iron to obtain the material;

[0056] S2. Putting the material obtained by pre-desulfurization in step S1 into a vacuum smelting converter for smelting to obtain an alloy steel billet;

[0057] S3, placing the alloy steel billet obtained in step S2 on a continuous casting machine for continuous casting operation to obtain alloy steel profiles;

[0058] S4. After heat-treating the alloy steel profile obtained in step S3, performing a cutting operation to obtain a crude alloy steel;

[0059] S5, sending the cut alloy steel crude product obtained in step S4 to a rolling mill for hot rolling and fine hot rolling to obtain a thin slab medium-high carbon steel product;

...

Embodiment 3

[0066] S1. Weigh the chemical composition as carbon 0.5%, silicon 0.15%, manganese 0.65%, phosphorus ≤ 0.025%, sulfur 0.002%, chromium 0.09%, nickel 0.08%, arsenic 0.02%, copper 0.18%, aluminum ≤ 0.02% and other The amount is iron, and the pre-desulfurization operation is carried out by using desulfurized molten iron to obtain the material;

[0067] S2. Putting the material obtained by pre-desulfurization in step S1 into a vacuum smelting converter for smelting to obtain an alloy steel billet;

[0068] S3, placing the alloy steel billet obtained in step S2 on a continuous casting machine for continuous casting operation to obtain alloy steel profiles;

[0069] S4. After heat-treating the alloy steel profile obtained in step S3, performing a cutting operation to obtain a crude alloy steel;

[0070] S5, sending the cut alloy steel crude product obtained in step S4 to a rolling mill for hot rolling and fine hot rolling to obtain a thin slab medium-high carbon steel product;

[...

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Abstract

The invention discloses a production process for medium-high carbon steel through thin slabs. The medium-high carbon steel comprises, by weight, 0.5%-0.88% of carbon, 0.15%-0.68% of silicon, 0.65%-1.55% of manganese, 0-0.025% of phosphorus, 0.002%-0.0025% of sulfur, 0.09%-0.22% of chromium, 0.08%-0.12% of nickel, 0.02%-0.035% of arsenic, 0.18%-0.20% of copper, 0-0.02% of aluminum and the balance iron. According to the production process for the medium-high carbon steel through the thin slabs, the medium-high carbon steel is produced through the thin slab continuous casting and rolling process, the production requirements are met by controlling process parameters of each procedure, and the problems existing in the background art are solved.

Description

technical field [0001] The invention relates to the technical field of steel alloys, in particular to a production process of high-carbon steel in thin slabs. Background technique [0002] At present, the process flow of medium and high carbon steel is: blast furnace molten iron - converter - LF refining - conventional slab continuous casting - heating - rolling - cooling - coiling - finished product. Due to the high carbon content of medium-high carbon steel, the solidification area is enlarged, and the center segregation and center porosity are prone to occur during the solidification process of the billet. After rolling, the central part of the coil is prone to delamination; and thermal stress are large, high-temperature thermoplasticity is low, and cracks inside and on the surface of the slab are prone to occur; in addition, the freezing point of medium-high carbon steel is low, the thermal melting amount of the mold is small, and the casting speed of conventional slab c...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/08C22C38/16C22C38/06C21D8/02C21D9/46
CPCC22C38/02C21D8/0226C21D8/0247C21D9/46C22C38/002C22C38/04C22C38/06C22C38/08C22C38/16C22C38/18
Inventor 唐时葵唐生宝王道路
Owner ANHUI CHUJIANG SPECIAL STEEL CO LTD
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